New opera: Author James B. Stewart, composer Christopher Theofanidis and the San Francisco Opera’s David Gockley discuss “Heart of a Soldier,” a new opera about 9/11. [6 p.m., Commonwealth Club, 595 Market St., S.F.]

Community dancing: Redwood City’s Dancing on the Square series presents an evening of community dancing. Today’s featured dance form: swing. [6 to 8 p.m., Courthouse Square, 2200 Broadway, Redwood City]Dining out